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Added preliminary support for execve(). Updates to clone, fork, exit, task handling.

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It turned out we used one version of kmalloc for malloc() and another for kfree()!
Now fixed.
Added parent-child relationship to tasks. Need to polish handling CLONE_PARENT and THREAD.
This commit is contained in:
Bahadir Balban
2008-11-19 12:59:52 +02:00
parent d182b5b35a
commit 46937eab88
39 changed files with 502 additions and 1192 deletions
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44
tasks/mm0/src/file.c
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@@ -5,7 +5,8 @@
*/
#include <init.h>
#include <vm_area.h>
#include <kmalloc/kmalloc.h>
#include <lib/malloc.h>
#include <mm/alloc_page.h>
#include <l4/macros.h>
#include <l4/api/errno.h>
#include <l4lib/types.h>
@@ -18,6 +19,7 @@
#include <globals.h>
#include <file.h>
#include <user.h>
#include <test.h>
/* Copy from one page's buffer into another page */
int page_copy(struct page *dst, struct page *src,
@@ -306,6 +308,27 @@ int read_file_pages(struct vm_file *vmfile, unsigned long pfn_start,
return 0;
}
/* Maps a page from a vm_file to the pager's address space */
void *pager_map_page(struct vm_file *f, unsigned long page_offset)
{
int err;
struct page *p;
if ((err = read_file_pages(f, page_offset, page_offset + 1)) < 0)
return PTR_ERR(err);
if ((p = find_page(&f->vm_obj, page_offset)))
return (void *)l4_map_helper((void *)page_to_phys(p), 1);
else
return 0;
}
/* Unmaps a page's virtual address from the pager's address space */
void pager_unmap_page(void *addr)
{
l4_unmap_helper(addr, 1);
}
int vfs_write(unsigned long vnum, unsigned long file_offset,
unsigned long npages, void *pagebuf)
{
@@ -456,6 +479,17 @@ int fsync_common(struct tcb *task, int fd)
return 0;
}
void vm_file_put(struct vm_file *file)
{
/* Reduce file's opener count */
if (!(file->openers))
/* No openers left, check any mappers */
if (!file->vm_obj.nlinks)
/* No links or openers, delete the file */
vm_file_delete(file);
}
/* Closes the file descriptor and notifies vfs */
int do_close(struct tcb *task, int fd)
{
@@ -466,12 +500,8 @@ int do_close(struct tcb *task, int fd)
if ((err = vfs_close(task->tid, fd)) < 0)
return err;
/* Reduce file's opener count */
if (!(--task->files->fd[fd].vmfile->openers))
/* No openers left, check any mappers */
if (!task->files->fd[fd].vmfile->vm_obj.nlinks)
/* No links or openers, delete the file */
vm_file_delete(task->files->fd[fd].vmfile);
/* Reduce file refcount etc. */
vm_file_put(task->files->fd[fd].vmfile);
task->files->fd[fd].vnum = 0;
task->files->fd[fd].cursor = 0;